package com.akino.gulimall.search.service.impl;

import com.akino.common.to.es.SkuEsModel;
import com.akino.common.utils.R;
import com.akino.gulimall.search.config.GulimallElasticSearchConfig;
import com.akino.gulimall.search.constant.EsConstant;
import com.akino.gulimall.search.feign.ProductFeignService;
import com.akino.gulimall.search.service.MallSearchService;
import com.akino.gulimall.search.vo.AttrResponseVo;
import com.akino.gulimall.search.vo.BrandVo;
import com.akino.gulimall.search.vo.SearchParam;
import com.akino.gulimall.search.vo.SearchResult;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author Akino
 * @version 1.0
 */
@Service
public class MallSearchServiceImpl implements MallSearchService {
    @Autowired
    private RestHighLevelClient client;
    @Autowired
    ProductFeignService productFeignService;
    @Override
    public SearchResult search(SearchParam param) {
        // 动态构建出查询需要的DSL语句
        SearchResult result = null;
        // 1.准备检索请求
        SearchRequest searchRequest = bulidSearchRequest(param);
        try {
            // 2.执行检索请求
            SearchResponse search = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);
            // 3.分析响应数据封装成需要的格式
            result = bulidSearchResult(search,param);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return result;
    }

    /**
     * 构建结果数据
     * @param response
     * @return
     */
    private SearchResult bulidSearchResult(SearchResponse response,SearchParam param) {
        SearchResult result = new SearchResult();
        // 1.返回的所有查询到的商品
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels = new ArrayList<>();
        if (hits.getHits()!= null&&hits.getHits().length>0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString,SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                esModels.add(esModel);
            }
        }
        result.setProducts(esModels);
        // 2.当前所有商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            // 得到属性id
            long attrId = bucket.getKeyAsNumber().longValue();
            // 得到属性名字
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            // 得到属性所有值
            List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = ((Terms.Bucket) item).getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValues);

            result.getAttrIds().add(attrId);

            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);
        // 3.当前所有商品涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            // 得到品牌id
            long brandId = bucket.getKeyAsNumber().longValue();
            // 得到品牌名
            String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            // 得到品牌图片
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandId(brandId);
            brandVo.setBrandName(brandName);
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }

        result.setBrands(brandVos);
        // 4.当前所有商品涉及到的所有分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            // 得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            // 得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);

            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);
        // ========以上从聚合信息中抽取========
        // 5.分页信息-页码
        result.setPageNum(param.getPageNum());
        // 6.分页信息-总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
        // 7.分页信息-总页码
        int totalPages = (int)total % EsConstant.PRODUCT_PAGESIZE == 0
                ? (int)total / EsConstant.PRODUCT_PAGESIZE
                : (int)total / EsConstant.PRODUCT_PAGESIZE - 1;
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1;i<totalPages;i++){
            pageNavs.add(i);
        }

        // 构建面包屑导航功能
        if (param.getAttrs()!=null&&param.getAttrs().size()>0){
            List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr->{
                // 分析每一个attrs传过来的查询参数值
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if (r.getCode() == 0){
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {
                    });
                    navVo.setNavName(data.getAttrName());
                }else {
                    navVo.setNavName(s[0]);
                }
                // 取消面包屑后，跳转到哪个地方（将请求地址的url里面的当前条件置空）
                // 拿到所有的查询条件，去掉当前
                String replace = replaceQueryString(param, attr,"attrs");
                navVo.setLink("http://search.gulimall.com/list.html?"+replace);
                return navVo;
            }).collect(Collectors.toList());
            result.setNavs(collect);
        }
        // 品牌，分类
        if (param.getBrandId()!=null&&param.getBrandId().size()>0){
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            // TODO 远程查询所有品牌
            R r = productFeignService.brandsInfo(param.getBrandId());
            if (r.getCode()==0){
                List<BrandVo> brand = r.getData("brand", new TypeReference<List<BrandVo>>() {
                });
                StringBuffer stringBuffer = new StringBuffer();
                String replace = null;
                for (BrandVo brandVo :brand) {
                    stringBuffer.append(brandVo.getBrandName()+";");
                    replace = replaceQueryString(param, brandVo.getBrandId()+"","brandId");
                }
                navVo.setNavValue(stringBuffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?"+replace);
            }
            navs.add(navVo);
        }
        // TODO 分类（不需要导航取消）

        return result;
    }

    private String replaceQueryString(SearchParam param, String attr,String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(key, "UTF-8");
            encode = encode.replace("+","%20");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        String replace = param.get_queryString().replace("&"+key+"=" + encode, "");
        return replace;
    }

    /**
     * 准备检索请求
     * @return
     * @param param
     */
    private SearchRequest bulidSearchRequest(SearchParam param) {
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder(); // 构建DSL语句
        /**
         * 模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存）
         */
        // 构建bool - query
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        // 1.1 must - 模糊匹配
        if (!StringUtils.isEmpty(param.getKeyword())){
            boolQueryBuilder.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }
        // 1.2 filter - 过滤
        // 三级分类id
        if (param.getCatalog3Id()!=null){
            boolQueryBuilder.filter(QueryBuilders.termQuery("catalogId",param.getCatalog3Id()));
        }
        // 品牌id
        if (param.getBrandId()!=null && param.getBrandId().size() > 0){
            boolQueryBuilder.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }
        // 库存
        if (param.getHasStock()!=null) {
            boolQueryBuilder.filter(QueryBuilders.termsQuery("hasStock", param.getHasStock() == 1));
        }
        // 价格区间
        if (!StringUtils.isEmpty(param.getSkuPrice())){
            RangeQueryBuilder skuPrice = QueryBuilders.rangeQuery("skuPrice");
            String[] s = param.getSkuPrice().split("_");
            if (s.length == 2){
                // 区间
                skuPrice.gte(s[0]).lte(s[1]);
            } else if (s.length == 1){
                if (param.getSkuPrice().startsWith("_")){
                    skuPrice.lte(s[0]);
                }
                if (param.getSkuPrice().endsWith("_")){
                    skuPrice.gte(s[0]);
                }
            }
            boolQueryBuilder.filter(skuPrice);
        }
        // 属性
        if (param.getAttrs()!=null&&param.getAttrs().size()>0){
            for (String attrStr :param.getAttrs()) {
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                String[] s = attrStr.split("_");
                String attrId = s[0]; // 检索的属性id
                String[] attrValues = s[1].split(":");  // 这个属性的检索用的值
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrI",attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));
                // 每一个必须都要生成一个nested查询
                NestedQueryBuilder attrs = QueryBuilders.nestedQuery("attrs",nestedBoolQuery, ScoreMode.None);
                boolQueryBuilder.filter(attrs);
            }
        }

        // 把以前的所有条件都拿来进行封装
        sourceBuilder.query(boolQueryBuilder);
        /**
         * 排序，分页，高亮
         */
        // 排序
        if (!StringUtils.isEmpty(param.getSort())){
            String sort = param.getSort();
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc")?SortOrder.ASC:SortOrder.DESC;
            sourceBuilder.sort(s[0], order);
        }
        // 分页 from = (pageNum-1)*size
        sourceBuilder.from((param.getPageNum()-1)*EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);
        // 高亮
        if (!StringUtils.isEmpty(param.getKeyword())){
            HighlightBuilder highlightBuilder = new HighlightBuilder();
            highlightBuilder.field("skuTitle");
            highlightBuilder.preTags("<b style='color:red'>");
            highlightBuilder.postTags("</b>");
            sourceBuilder.highlighter(highlightBuilder);
        }
        /**
         * 聚合分析
         */
        // 品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        // 品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);
        // 分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);
        // 属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attr_id_agg);
        sourceBuilder.aggregation(attr_agg);
        SearchRequest request = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);
        return request;
    }
}
